Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Aluminum
NORMA vydaná dňa 1.8.2017
Označenie normy: ASTM E266-17
Dátum vydania normy: 1.8.2017
Kód tovaru: NS-797372
Počet strán: 4
Približná hmotnosť: 12 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
activation, activation reaction, aluminum, cross section, dosimetry, fast-neutron monitor, neutron metrology, pressure vessel surveillance, reaction rate,, ICS Number Code 17.240 (Radiation measurements), 27.120.30 (Fissile materials and nuclear fuel technology)
|Significance and Use|
5.1 Refer to Guide for the selection, irradiation, and quality control of neutron dosimeters.
5.2 Refer to Practice for a general discussion of the determination of fast-neutron fluence rate with threshold detectors.
5.3 Pure aluminum in the form of foil or wire is readily available and easily handled. 27Al has an abundance of 100 % 5.4 24Na has a half-life of 14.958 (2)5.5 shows a plot of the Russian Reactor Dosimetry File (RRDF) cross section FIG. 1 27Al(n,α)24Na Cross Section, from RRDF-2008/IRDFF-1.05 Library, with EXFOR Experimental Data
5.6 Two competing activities, 28Al and 27Mg, are formed in the reactions 27Al(n,γ) 28Al and 27Al(n,p) 27Mg, respectively, but these can be eliminated by waiting 2 h before counting.
1.1 This test method covers procedures measuring reaction rates by the activation reaction 27Al(n,α)24 Na.
1.2 This activation reaction is useful for measuring neutrons with energies above approximately 6.5 MeV and for irradiation times up to about 2 days (for longer irradiations, or when there are significant variations in reactor power during the irradiation, see Practice ).
1.3 With suitable techniques, fission-neutron fluence rates above 106 cm−2·s−1 can be determined.
1.4 Detailed procedures for other fast neutron detectors are referenced in Practice .
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
|2. Referenced Documents|
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